Extended Goldman symplectic structure in Fock-Goncharov coordinates

2019/10/12 by Marco Bertola, Bertola, Marco, Dmitry Korotkin +1
Mathematics · #Advanced Algebra and Geometry #FOS: Mathematics #FOS: Physical sciences #Finite Group Theory Research #Geometric and Algebraic Topology #Mathematical Physics (math-ph) #Symplectic Geometry (math.SG)

paper · pdf · doi:10.48550/arxiv.1910.06744

openalex publication_date 2019/10/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The goal of this paper is to express the extended Goldman symplectic structure on the SL(n) character variety of a punctured Riemann surface in terms of Fock-Goncharov coordinates. The associated symplectic form has integer coefficients expressed via the inverse of the Cartan matrix. The main technical tool is a canonical two-form associated to a flat graph connection. We discuss the relationship between the extension of the Goldman Poisson structure and the Poisson structure defined by Fock and Goncharov. We elucidate the role of the Rogers' dilogarithm as generating function of the symplectomorphism defined by a graph transformation.

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